Hi! I just had my rear brakes (Drum Style) replaced at 65,000 klms. Afte going for my semi annual inspection my dealer indicated I had only 2 mm left onmy rear shoes. I found this odd since I only tow occasionally ( boat and landscape trailer) and nomally do not carry heavy loads. Also with my last truck a 2001 Silverado 1500 HD, I changed rear brakes (Disc sytle) at 95,000 KLMS.